We also find this hadith in Bukhari, chapter virtues of Imam Ali that holy Prophet said “O Ali you are from me and I am from you.” We are posting the link from Saudi official website, Ministry of religious affairs. 

We could not find this hadith from Sunnah.com, This is very famous hadith also narrated in Tarimdhi and Nissaie 

If there are no other proofs, only above two Ahadith which are proven true Ahadith (also nararted in other books) can solve the matter of successorship of Prophet Mohammad (pbuh).